Abstract
A greenhouse experiment was conducted to evaluate the effects of different inoculum densities of two Saudi isolates of
Trichoderma harzianum
and
Trichoderma viride
against
Meloidogyne javanica
on tomato. Four densities (10
4
, 10
6
, 10
8
and 10
10
spores/g of soil) of each fungus were used. The results indicate that all four inoculum densities of the two
Trichoderma
species suppressed the nematode reproduction and root galling; and increased the growth of tomato plants, compared to controls. Efficacy of both fungi increased as their inoculum densities increased. Generally, efficacy of
T. harzianum
was better than that of
T. viride
, especially at the highest used density (10
10
spore/g soil) which resulted in the best control.